Hello,
Although this message is more about gcc, I post here,
since I got no answer from gcc mailing lists.
I use egcs-2.91.66(Algorithmics tools) configured as a
cross-compiler on a i386 host. I got the binary
version, so didn't configured it myself.
I'm working with a PR3900 type MIPS core. Those core
don't have a Floating Point Unit, nor floating point
registers.
When using -msoft-float, I am supposed to use the
libgcc soft floating point emulation. However, I
cannot prevent gcc from using fp registers.
When looking at gcc specs:
$ mips-linux-gcc -dumpspecs | grep r3900
..
%{m3900:-mips1 -mcpu=r3900 -mfp32 -mgp32}...
The option -mfp32 is defined as the default, which
means gcc assume 32 bit fp registers are available.
I am aware of two soft-float emulation libraries:
Gofast and libgcc. However I can't figure out how
emulation can be achieved if gcc keeps using fp
registers.
I must miss something about it, could someone help me
with this matter ?
Many thanks,
Alain
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